AS Number Details

This will give your details about your Autonomous System Number

MCP Server

The AS Number lookup is also available as an MCP (Model Context Protocol) server. AI assistants and agents that speak MCP — such as Claude — can generate Mikrotik firewall address lists directly instead of using the web form.

Endpoint

The server is hosted on this site at the address below, using the streamable HTTP transport (stateless) and no authentication, just like the public API:

https://asnumber.samayas.eu/mcp

Tools

analyze_as_number — generates Mikrotik firewall address-list add rules for all announced ip addresses of an Autonomous System Number (ASN), for Ipv4 or Ipv6, with optional per line comments and a custom address list name — the same computation as the analyze page.

The tool is read-only and idempotent.

Parameter	Type	Required	Default	Description
`asNumber`	string	yes	—	Autonomous System Number to look up, e.g. 15169.
`listName`	string	yes	—	Name of the Mikrotik firewall address list to add the rules to, e.g. blocked_as.
`ipType`	Ipv4 \| Ipv6	no	Ipv4	Ip type of the addresses in the list: Ipv4 or Ipv6.
`hasComment`	boolean	no	false	True to add a custom comment behind each line.
`hasDefaultComment`	boolean	no	true	True to add the default robtex comment behind each line.
`comment`	string	no	empty	Custom comment behind each line, used when hasComment is true.

Example arguments:

{
  "asNumber": "15169",
  "ipType": "Ipv4",
  "listName": "blocked_as"
}

Example response:

#Mikrotik Firewall Address list generated by asnumbers.samayas.eu version 10.0.0
ip firewall address-list
add address=192.0.2.0/24 comment=https://www.robtex.com/as/AS15169 list=blocked_as
add address=198.51.100.0/24 comment=https://www.robtex.com/as/AS15169 list=blocked_as

Setup

Add the server to any MCP client configuration:

{
  "mcpServers": {
    "as-number": {
      "url": "https://asnumber.samayas.eu/mcp"
    }
  }
}

Claude Code CLI

claude mcp add --transport http as-number https://asnumber.samayas.eu/mcp

GitHub Copilot CLI

copilot mcp add --transport http as-number https://asnumber.samayas.eu/mcp

Cursor

Cursor has no documented CLI add command — save the configuration above as .cursor/mcp.json in the project, or ~/.cursor/mcp.json globally.

The MCP endpoint is rate limited to 20 requests per minute per client. When the limit is exceeded, the endpoint responds with HTTP 429 Too Many Requests and a Retry-After header.